| ditch(noun, channel, pit, conduit, groove) |
| ravine(noun, break, cut, crack, opening) |
| channel(noun, water, opening, ditch, conduit) |
| chasm(noun, break, cut, crack, rest) |
| gap(noun, break, cut, crack, rest) |
| canal(noun, opening, ditch, channel, pit) |
| canyon(noun, break, cut, crack, rest) |
| gorge(noun, break, cut, opening, drain) |
| trench(noun, limit, drain, ditch, channel) |
| groove(noun, groove) |
| gutter(noun, drain, ditch, channel, pit) |
| furrow(noun, drain, interval, ditch, channel) |
| crevasse(noun, interval, ditch, ravine, small ravine) |
| trough(noun, depression, ditch, channel, pit) |
| defile(noun, break, cut, crack, rest) |
| gulch(noun, break, cut, opening, drain) |
| notch(noun, break, cut, crack, rest) |
| pass(noun, interval) |
| watercourse(noun, drain, flow, ditch, channel) |
| gulley(noun, channel, trench, valley, ravine) |